Drying and cooling apparatus



Aug. 10 1926.

H. W. HOW

DRYING AND COOLING APPARATUS Filed Dec. 26

Attyis.

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Patented r run". 10, 192%.

UNITED STAil' 'ES rsassse ee'raur caries.

EAR-LAN W. HOW, OF BUFFALO, NEJV YORK, ASSIGNOR TO BUFFALO FOUNDRY 8.:MACHINE COMPANY, OF BUFFALO, NEVJ YORK, A CORPORATION OF NEW YORK.

DRYING AND COOLING APPARATUS.

Application filed December 26, 1923. Serial No. 682,837.

This invention relates to a cooling and drying apparatus which embodiesin its general organizat'on a rotary shell or drum through which thematerial to be treated is passed from one end' to the other and duringthis passage is subjected either to a heating or cooling medium andelevated within the shell during such passage, so as to thoroughlyexpose allparts of thematerial to the heating or cooling mediumand thusfacilitate finishing of'theiproduct,

In devices of this character asfheretofore constructed the materialunder treatment engaged directly with the inner" side of the wall orshell of the apparatus and this necessitated dismountingthe entireapparatus including the dismemb'erin'g ofits bearings, drivingmechanism, and so forth,"whenever the shellor wall required renewal. Insuch apparatus 7 as V heretofore constructed, the temperature insulationwas usually applied to the outer side of the shell which isobjectionable by reason of the fact that itwas difficult to firmlyattach suchinsulation on the exterior of the shell and this resulted inthe insulation frequently becoming separated from the shell and fallingoff and necessitating frequent repairs.

It is the object of this invention to provide an apparatus of thischaracter in which the temperature insulation is arranged on the innerside of the shell where the same cannot become detached therefrom andalso to provide the shell on its inner side with a lining which receivesthe wear and is capable of being renewed from time to time whenever thislining, become-s worn out,

thereby enablingthe main shell'or wall to be employed continuously andavoiding'the necessity ofdismembering the apparatus to any considerableextent when repairs 'or making replacements due to wear mustbe effected.

lnthe accompanying drawings:

Figure 1 is a vertical longitudinal section showing a practicalembodiment of my invention in a rotary drier or cooler. Figure 2 is avertical cross section of the same on an enlarged scale taken on line 22, Figure 1. Figure?) is a fragmentary cross section of theshell, takenon an enlarged scale, the temperature insulations and internal lining onthe same and also the material, lifting blades or buckets mounted on theinner side of the shell.

'tially thereof are Similar characters of reference refer to like partsin the several views.

-The numeral 10 represents the cylindrical shell, drum or wall of theapparatus which is preferably constructed of sheet metal in the mannernow commonly practiced, and rotatable about an axis whichis either i11-clined slightly from its front end toward its rear end relatively to thehorizontal, as shown in Figure 1, or may be arranged horizontally or inany other desired'ipositionas best suits the particular material whichis to be treated. This shell may be rot'atably supported by any suitablemeans, but'in the preferred construction this is accomplished by"providing the shellon its periphery near its front and rear ends withcircumferential tires or rings 11, 12 which run on supporting rollers 13engaging with the underside of the tires'and mounted in suitable man'-ner upon base blocks 14'.

int-he present instance, the material is assumed to enter at the frontend 15 of the shell which is elevated anddischarged therefrom at itsdepressed rear end 16. When the material under treatment is to beheated, this may be accomplished by conducting heat from anoven 17 intothe depressed rear end of'the shell from whence it passes forwardlythrough the latter and iscarried away from the elevated front endthereof into a stack or chimney 18. Various means may be employed forrotating this shell by power, but as the same form no part ofthisinvention no particular reference" will'be made "to them. i r I,Arranged. lengthwise on the inner side of the shell at different pointscircumferenplurality of metal Jrib s, each of which is preferablyconstructed of L-shape or in the form of an angle iron'arid arrangedwith its outer base dang-e19 substantially parallel or concentric 'witlthe shell: and adjacent to the inner side thereof, while its innerflange '20 projects radially inward from one edge of the base flange. inorder to reduce the transmission of temperature from the interior of theshell to the outer side thereofthrough the medium f these ribs, a heatinsulating strip 21 con sisting preferably of asbestos is interposedbetween the base of each rib and the inner side of the shell and rivets22 are passed through the shell, the baseiof eachrib and the interveningtemperature insulating strip 21 for the purpose of lirmly uniting thesemembers, as best shown in Figure 3. Temperature changes within the shellare also pr vented from reaching the exterior of the same along thespaces between the ad centribs by means or a temperature insuia 23 whichis preferably constructed of mental form and e i 'ed its opposite lon kgitudinal edges with the opposing sides two adjacent ribs while itsouter side engages with the inner side of the adjacent part of theshell.

This segmental temperature insulation is preferably constructed ofcellular asbestos, as shown in Figure 3, but ii desired any othersuitable temperature insulation may be used such as magnesia. Upon theinner edge of the radial i'la'n 'e of each rib is mounted a liftingwing, blade or bucket 24 which is preferably constructed of sheet metal.The inner side of the segmental temperature insulation between adjacentribs is covered by a lining 25 of metal which is of segmental form andpreferably concentrio with the shell and constructed or sheet metal.Each of these segmental lining sections is detachably mounted on theadjacent ribs of the shell so that the same can be removed therefromwhen reduir-ed by pro viding the longitudinal lining section 25 withinwardly projecting flanges 26 and 27, the flange 26 engaging with oneside of the lifting blade 24: which is mounted on one of the respectivepair of ribs, while the flange 27 engages with the adjacent side of theradial flange of the rib upon which the other lifting blade 01 therespective pair is mounted. The radial flange of each rib, the liftingblade 2% and the two flanges 26, 27 of the proximate lining sections 25on opposite sides of the same are d-etachably connected with each otherby means of bolts 28 passing through these members, as best shown inFigure 3.

Obviously cold air or air of ordinary temperature may be conductedthrough this shell by any suitable means if it is intended to cool thematerial under treatment instead of heating and drying the same, itbeing understood that the material while passing from the inlet to theoutlet of the shell is repeatedly lifted by the blades or buckets, so asto expose the material to the action of the hot air, cold .air or othermedium which is intended to act upon the material.

W hen this apparatus is in use, the material under treatment whichpasses through the shell engages with the inner sides of the liningsections 25 so that any wear resulting from the attrition of this:material will be taken by these lining sections, and when the same areworn out it is possible to easily renew them .and thereby save the shellor main wall 10 from such wear. Such renewal can be effected quicklywithout the necessity of dismounting the shell itself, thereby enablingsuch renewal to be effected economically and without prolonged interruption in the use of the apparatus which otherwise would be necessary.

Furthermore, by arranging the temperature insulation on the inner sideof the shell in the manner shown and described, this insulation is heldfirmly in place and is not liable to become dislodged when the ma chineis in use, thereby enabling the same insulation to be used continuouslywithout requiring any replacement and thus further increasing theeconomical operation of the machine. 7

Moreover, the manner in which this rnewal lining and the temperatureinsulating elements are constructed, mounted and arranged within theshell permits of constructing this apparatus by means of ma terialswhich are of standard construction and thereby enables this apparatus tobe manufactured at comparatively low cost.

I claim as my invention:

1. A drying and cooling apparatus comprising a rotary tubular shell, atemperature insulation engaging with the inner side of said shell, and arenewable lining engaging with the inner side of said insulation.

2. A drying and cooling apparatus comprising a rotary tubular metalshell, a plurality of longitudinal metal ribs secured to the inner sideof the shell, temperature insulation interposed between said ribs andthe shell, and lifting blades mounted on said ribs.

3. A drying and cooling apparatus comprising a rotary tubular metalshell, a plurality of longitudinal metal ribs secured to the inner sideof the shell, temperature in sulation interposed between said ribs andthe shell, and temperature insulation arranged on the inner side of saidshell be- 7 tween said ribs.

4. A drying and cooling apparatus comprising a rotary tubular metalshell, a plurality of longitudinal metal ribs secured to the inner sideof the shell, temperature insulation interposed between said ribs andthe shell, lifting blades mounted on said ribs, and temperatureinsulation arranged on the inner side of said shell between said ribs.

5. A drying and cooling apparatus comprising a rotary tubular metalshell, a plurality of longitudinal metal ribs secured to the inner sideof the shell, temperature insulation interposed between said ribs andthe shell, temperature insulation arranged on the inner side of saidshell between said ribs, and an inner metal lining arranged on the innerside of the insulation between adjacent ribs.

6. A drying and cooling apparatus comprising a rotary tubular metalshell, a plurality of longitudinal metal ribs secured to the inner sideof the shell, temperature insulation interposed between said ribs andthe shell, temperature insulation arranged on the inner side of saidshell between said ribs, and an inner metal lining arranged on the innerside of the insulation between adjacent ribs and detachably connectedwith the latter.

7. A drying and cooling apparatus comprising a rotary tubular shell, aplurality of longitudinal metal ribs of L-shaped form in cross sectioneach having an outer base flange arranged circumferentially next to theshell and secured thereto and having an inner attaching flangeprojecting radially inward from the base flange, a temperatureinsulating member arranged between each base flange and the shell,temperature insulating segments arranged on the inner side of the shellbetween said ribs, lifting blades secured to the inner edges of theradial flanges of said ribs, and metal lining sections engaging with theinner sides of said insulating segments and provided with inwardlyturned flanges which are secured to opposite sides of said radialflanges and blades. 7

In testimony whereof I aflix my signature.

HARLAN W. HOW.

